Static eliminator



Feb. 21, 1933. J. GOMERY STATIC ELIMINATOR Filed June 24, 1951 2 SheetsSheet 1 IFS Ea]- INVENTOR. cja syb @arwezy BY I W ATTORNEYS.

Patented Feb. 21, 1933 JOSEPH GOMEBY, OF LOS ANGELES, CALIFORNIA STATIC ELIMINATOR Application filed June 24, 1931. Serial No. 546,659.

My invention relates broadly to devices for eliminating stray disturbances in radio reception and more particularly to a type of device which is connected between the antenna and the receiving set for the purpose of greatly reducing or entirely eliminating such stray disturbances.

An object of my invention is to provide a system of concentric cylindrical elements which will be effective in separating stray disturbances from the signal which it is desired to receive.

A further object of my invention is to provide a system of filters which will prevent stray electrical disturbances from reaching the receiving set.

Still another object of the invention resides in providing a device which is simple and durable in construction, inexpensive to manufacture and one which will be very efficient in use.

In receiving radio signals, it is a general experience that stray electrical disturbances are often received on the antenna together with the desired signal and may be of such strength as to very greatly interfere with reception. I have discovered that it is pos" sible by an arrangement of concentric cylinders and filter elements to very greatly re duce such stray electrical disturbances or entirely eliminate them so that a clear signal may be received.

With these and numerous other objects in view, my invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter referred to and more particularly pointed out in the specification and claims.

In the accompanying drawings forming a part of this application:

Figure 1 shows a circuit arrangement of my invention together with a general crosssectional view of the concentric cylindrical system;

Figure 2' is taken on the line 22 of F igure 3 and shows a vertical sectional view of the glass container and the concentric cylinders therein contained;

Figure 3 is aview taken on the line 33 of Figure 2 and shows in detail a cross sectional view of the glass container and the concentric cylinders therein.

In describing the invention, I shall refer to the drawings in which similar reference characters designate corresponding parts throughout the several views, and in which the numeral 1 designates a cylindrical container formed of insulating material such as glass. The numeral 2 denotes a layer of metal foil such as tinfoil with which the container 1 is lined on its inner cylindrical surface. The numeral 3 denotes a metallic cover plate for the container 1 and has screw flanges 4 adapted to retain the cover plate 3 tightly in position. The cover plate 3 is apertured to receive the insulating sleeve members 5 and 6 through which conductors 7 and 17 pass. The conductor 7 conveys the received energy from the antenna to the system of cylindrical plates and is connected at 7a to the central point of the metallic base plate 9. Conductor 7 passes substantially parallel to the axis of the container 1 through its entire height and is covered with metallic foil 8. The base plate 9 is provided with feet 10 to support it above the bottom of the receptacle 1. The numerals 11, 12, 14 and 15 denote concentric metallic cylinders which may be formed of suitable material such as copper or brass. 13 is a layer of insulating material such as impregnated paper which is attached to the exterior surface of the cylinder 11.

The cylinder 14 is provided over the quadrant portion of its surface nearest input connection 7 with a layer of metal foil 16. The cylinders 11 and 15 are supported in conductiverelationship from the metal cover plate 3. Cylinders 11 and 12 are supported in conductive relationship upon the base plate 9. A plate 18 is mounted intermediate the outer cylinder 15 and the inner surface of the container 1. Plate 18 is of comparatively small dimensions as shown and is connected to the post 17 extending through sleeve member 6. Plate 18 is of suitable metallic composition and may be provided with a surrounding layer of insulating material 19 such as impregnated paper and an outer layer of metallic foil drical plates. The plate 18 is connected by' wire 26 to ground 23. The binding post21 is connected by the wire 27 shown in heavy line, to the antenna terminal 34 of receiving set 33. The ground connection 35 of the receiving set 33 is connected to the ground 23.

Condensers 28 and 29 are connected in filter arrangement between the antenna and ground. The numeral 30 denotes an inductance member and 31 a condenser connected in shunt which I have found to be a desirable arrangement to eliminate static, paticularly of the type which comes in heavy bursts. The numeral 32 is a condenser connected between binding post 21 and the ground.

In practice, I have found it desirable to.

substantially fill container 1 with liquid insulating material such as clean vegetable oil shown at 1a.

The particular arrangement of condensers and inductance which I have shown has been found to be very effective and substantially eliminates stray disturbances when used in connection with the system of concentric cylinders. The received energy from I energy received from the antenna is delivthe antenna 22 is delivered through the con ductor 7 to base plate 9 and thence to cylinders 11 and 12. The energy passes through the liquid dielectric 1a to cylinders let and 15 and thence the useful signal passes to the cover plate 3. The metallic foil carried by the cylinders assists in proper distribution of the electric field.

I have discovered that the undesired stray signals will not pass in any substantial quantity to cylinders 14 and 15 but will collect on plate 18, whence they may be drawn off on the conductor 26 and delivered to the ground 23. The system of cylindrical plates, therefore, ofiers a very effective means of separating the desired signal from the undesired strays. The quadrant 16 of metallic foil is effective in maln'ng the cylinder 1% more sensitive to the energy carried by input conductor 7 The filter systems 28, 29, 36,31 and32 further assist in separating any undesired signals which may be delivered from output terminal 21 from the desired signals. Such undesired signals are delivered to the ground terminal 23. The

ered at thev center point 7a of base plate 9 and is thence distributed symmetrically throughout the system of cylinders which fact materially assists in the proper functioning of the apparatus. The arrangement of my invention is efiective' not only in receiving signals of the frequencies which are used for broadcast transmission but also for short waves.

The arrangement of my invention has been used successfully'for eliminating static in reception of stations over distances greater than two thousand miles and has been. found to' be: very efiective. I have found that the clean vegetable oil which i have employed will not. form a crust or short-circuit. the cylinders and may be used without such dificulties over a long period of time. A certain amount of'the static will accumulate on the tinfoillining of the container- 1 and then will be discharged throughplate 18. r

I have found that this system of my invention is very efiective in materially improving reception of radio signals and greatly. increasing the usefulness of any receiving set.

From the foregoing description of the construction of my improved static eliminator, the application of the same to-use will be readilyunderstood. It will. be seen that I have provided a simple, inexpensive and efficient means for carrying out the objects of the invention.

While Ihave particularly described the elements best adapted to perform the func-= tionsset forth, it is obvious that various changes in. form, proportion and in the minor details of construction may be resorted to, without departing from the spirit or sacrificing any of the principles of the invention.

Having thus described my invention, what I claim is 1. In a static eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle, ametallic cap member fitting on the top of said receptacle, a plurality of concentric metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic'cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, and anauxiliary metallic plate positioned in said receptacle outside the outer one of said cylinders, said receptacle being filled with a liquid dielectric, a connection from the center of said base plate to said source of received radio waves, a connection from said metallic cap member to said signal responsive device, and a connection from said auxiliary plateto ground.

2. In aifstatic eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle having its inner surface lined with metallic foil, a metallic cap member fitting on the top of said receptacle, a plurality of concentric metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, and an auxiliary metallic plate positioned in said receptac e outside the outer of said cylinders, said receptacle being filled with a liquid dielectric, a connection from the center of said base plate to said source of received radio waves, a 0on nection from said metallic cap member tosaid signal responsive device, and a connection from said auxiliary plate to ground.

3. In a static eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle having its inner surface lined with metallic foil, a metallic cap member fitting on the top of said receptacle, a plurality of concentric metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, and an auxiliary metallic plate positioned in said receptacle outside the outer of said cylinders, said receptacle being filled with a liquid dielectric, a connection passing inside said receptacle and outside the outer of said cylinders and parallel to the axis thereof insulatingly through said cap member and connecting the center of said base plate to said source of received oscillations, a connection from said metallic cap member to said signal responsive device, and a connection from said auxiliary plate to ground.

4. In a static eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle having its inner surface lined with metallic foil, a metallic cap member fitting on the top of said receptacle, a plurality of concentric metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, an auxiliary metallic plate positioned in said receptacle outside the outer of said cylinders, said receptacle being filled with a, liquid dielectric, a connection from the center of said base plate to said source of received radio waves, a connection from said metallic cap member to said signal responsive device, and a connection from said auxiliary plate to ground, a tuned filter connected between said source of received oscillations and ground, and a filter system comprising a plurality of condensers connected between said metallic cap member and ground.

5. In a static eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle having its inner surface lined with metallic foil, a metallic cap member fitting on the top of said receptacle, a plurality of concentric 'metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, and an auxiliary metallic plate positioned in said receptacle outside the outer of said cylinders, said receptacle being filled with a liquid dielectric, a connection passing inside said receptacle and outside the outer of said cylinders and parallel to the axis thereof insulatingly through said cap member and connecting the center of said base plate to said source of received oscillations, a connection from said metallic cap member to said signal responsive device, and a connection from said auxiliary plate to ground, the inner of said cylinders depending from said cap having the quadrant of its outer service nearest said connection to said base plate covered with metallic foil.

6. In a static eliminator to be connected between a source of received oscillations and a signal responsive device, a glass receptacle having its inner surface lined with metallic foil, a metallic cap member fitting on the top of said receptacle, a plurality of concentric metallic cylinders positioned in said receptacle, a conducting base plate in the bottom of said receptacle, alternate metallic cylinders depending from said metallic cap member in conductive relation and the remaining metallic cylinders being conductively carried by said base plate, an auxiliary metallic plate positioned in said receptacle outside the outer of said cylinders, said receptacle being filled with a liquid dielectric, a connection passing inside said receptacle and outside the outer of said cylinders and parallel to the axis thereof insulatingly through said cap member and connecting the center of said base plate to said source of received oscillations, a connection from said metallic cap member to said signal responsive device, and a connection from said auxiliary plate to ground, said auxiliary plate and said connection to the center of said base plate being covered with metallic foil.

In testimony whereof, I afiix my signature.

JOSEPH GOMERY. 

